When paintings don't go too well, the trick is to move on to something nice and easy and satisfying. What could be more enjoyable than pouring paint?
I came across this little video, and it looked so simple! - Note that he doesn't show you the crucial bit - between pouring the paint and the first swooshing back and forth!
My first hurdle is that I didn't have self-levelling acrylics. But never fear - a quick mix with a dollop of Liquitex Pouring Medium and a dash of Liquitex Flow Aid, plus a little water, and I had paint more or less to the right consistency. It was a little too solid, to be honest, and my first draft showed patches where I'd had to push the paint along with a painting knife.